Total Cost in JOptionPane not showing up

How do I get the total cost to show up as a joptionpane, and the beverages in it as well. I was asked to simulate a Breakfast ordering system for BeBe’s Best Breakfast. I am to display a JOptionPane to prompt the user for choices of breakfast and a beverage to order. I am then to provide a prompt for the number of these breakfasts to be ordered by the office (from 1 - 5) and use a Scanner object to read in his input. And then output the user’s Bill in a JOptionPane.